CB

This is due to K2 loading in CB API for its CB integration in its Joomla system plugin. It's loading too early. We need to figure out a way to avoid these conflicts so they won't break CBs installer.

K2 also breaks our Application::Input() usage somehow, which results in some values being missing (specifically view) and breaks CB Conditional as it's unable to determine its location based off view anymore. We may need to review how they're loading CB and see if we can workaround the issue.

CBSubs Joomla system plugin also causes this as the CB API is loaded before install causing CBLib loading of legacy classes to conflict.

krileon wrote:

K2 also breaks our Application::Input() usage somehow, which results in some values being missing (specifically view) and breaks CB Conditional as it's unable to determine its location based off view anymore. We may need to review how they're loading CB and see if we can workaround the issue.

The issue with Application::Input() , reported separately in #5340 is fixed.

CBSubs 4.0's too early loading is fixed too. Of course, it doesn't fix cases where CBSubs 1.x-3.x are already installed.
The base issue remains.

It would be easy to avoid the fatal error in CBTxt. But the big question is what else will half fail, since it's all the old CB 1.9.1 library classes which are already loaded.

So not sure if we should remove that fatal error, and "wait" for the next one, or even have no fatal error, but then a wrongly updated installation ?

To avoid the fatal error, it would be just to add the text above on line 131 (and below on line 172):

        if ( $languageKeys == '' ) {

changed to:

        if ( ( $languageKeys == '' ) || ! static::$self ) {

However I'm not convinced that we should do that, as we really want that fatal error to be possible.